Sahih Al Bukhari Hadith Number 1045

Narrated `Abdullah bin `Amr: “When the sun eclipsed in the lifetime of Allah’s Messenger (peace be upon him) an announcement was made that a prayer was to be offered in congregation.”

16  Eclipses
Hadith number 1045
Volume no 2
Chapter: 3 (Making a loud announcement of As-Salat (the prayer) in congregation for eclipse)